Correlation between multifidus muscle atrophy, spinopelvic parameters, and severity of deformity in patients with adult degenerative scoliosis: the parallelogram effect of LMA on the diagonal through the apical vertebra

Table 7 Multiple linear regression analysis of influencing factors and ODI

Influencing factors	Variables	B value	Standard error	t value	P value	R² value
Spinopelvic parameters	PI	0.407	0.055	7.462	< 0.001	0.680
	PT	− 0.229	0.048	− 4.788	< 0.001
	SS	− 0.466	0.049	− 9.556	< 0.001
	Constant	57.972	0.984	58.886	< 0.001
Concave or convex LMA at the upper or lower intervertebral level of the apical vertebra	Lower intervertebral level LMA					0.051
	Concave	0.735	0.350	2.099	0.038
	Convex	− 0.668	0.258	− 2.586	0.011
	Constant	61.984	0.848	73.134	< 0.001

PI pelvic incidence, PT pelvic tilt, SS sacral slope, ODI Oswestry Disability Index